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    <h2 id="什么是节流"><a href="#什么是节流" class="headerlink" title="什么是节流"></a>什么是节流</h2><p>节流的核心是：触发事件，执行任务并设置时间间隔，如果时间间隔内有触发行为就取消任务，如果时间间隔后有触发行为，就再次执行任务并设置时间间隔</p>
<h2 id="定时器版本"><a href="#定时器版本" class="headerlink" title="定时器版本"></a>定时器版本</h2><p>在持续触发事件的过程中，函数不会立即执行，并且会等待delay秒执行一次</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">throttle</span>(<span class="params">fn,delay</span>)</span>&#123;</span><br><span class="line">  <span class="keyword">let</span> timeout;</span><br><span class="line">  <span class="keyword">return</span> <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="keyword">let</span> context = <span class="built_in">this</span>;</span><br><span class="line">    <span class="keyword">let</span> args = <span class="built_in">arguments</span>;</span><br><span class="line">    <span class="keyword">if</span>(!timeout)&#123;</span><br><span class="line">      timeout = <span class="built_in">setTimeout</span>(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        timeout = <span class="literal">null</span>;</span><br><span class="line">        fn.apply(context,args);</span><br><span class="line">      &#125;,delay)</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="时间戳版本"><a href="#时间戳版本" class="headerlink" title="时间戳版本"></a>时间戳版本</h2><p>在持续触发事件的过程中，函数会立即执行，并且会每delay秒执行一次</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">throttle</span>(<span class="params">fn,delay</span>)</span>&#123;</span><br><span class="line">  <span class="keyword">let</span> pre = <span class="number">0</span>;</span><br><span class="line">  <span class="keyword">return</span> <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="keyword">let</span> context = <span class="built_in">this</span>;</span><br><span class="line">    <span class="keyword">let</span> args = <span class="built_in">arguments</span>;</span><br><span class="line">    <span class="keyword">let</span> now = +<span class="keyword">new</span> <span class="built_in">Date</span>();</span><br><span class="line">    <span class="keyword">if</span>(now - pre &gt; delay)&#123;</span><br><span class="line">      fn.apply(context,args);</span><br><span class="line">      pre = now;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="防抖与节流的区别"><a href="#防抖与节流的区别" class="headerlink" title="防抖与节流的区别"></a>防抖与节流的区别</h2><p>如果事件触发频繁，防抖中的计时会不断重置，从而会不断延迟了函数的执行，而节流中的计时器不会因为事件的触发而重置，仅仅是取消事件的触发</p>

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